2005 INFINITI QX4 Factory Service Manual

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Page 1601 of 3419

INFINITI QX4 2005 Factory Service Manual EC-410Revision: October 2005
DTC P1128 THROTTLE CONTROL MOTOR
2005 QX56
DTC P1128 THROTTLE CONTROL MOTORPFP:16119
Component DescriptionUBS00H7V
The throttle control motor is operated by the ECM and it

Page 1602 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1128 THROTTLE CONTROL MOTOR
EC-411
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Revision: October 20052005 QX56
Wiring DiagramUBS00H7Y
BBWA1696E

Page 1603 of 3419

INFINITI QX4 2005 Factory Service Manual EC-412Revision: October 2005
DTC P1128 THROTTLE CONTROL MOTOR
2005 QX56
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-I

Page 1604 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1128 THROTTLE CONTROL MOTOR
EC-413
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Revision: October 20052005 QX56
2. CHECK THROTTLE CONTROL MOTOR OUTPUT SIGNAL CIRCUIT FOR OPEN OR SHORT
1. Disconnect electric throttl

Page 1605 of 3419

INFINITI QX4 2005 Factory Service Manual EC-414Revision: October 2005
DTC P1128 THROTTLE CONTROL MOTOR
2005 QX56
Removal and InstallationUBS00H81
ELECTRIC THROTTLE CONTROL ACTUATOR
Refer to EM-15, "INTAKE MANIFOLD" .

Page 1606 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1146, P1166 HO2S2
EC-415
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Revision: October 20052005 QX56
DTC P1146, P1166 HO2S2PFP:226A0
Component DescriptionUBS00H82
The heated oxygen sensor 2, after three way cataly

Page 1607 of 3419

INFINITI QX4 2005 Factory Service Manual EC-416Revision: October 2005
DTC P1146, P1166 HO2S2
2005 QX56
DTC Confirmation ProcedureUBS00H85
NOTE:
If DTC confirmation Procedure has been previously conducted, always turn ignition switch OFF and

EC-416Revision: October 2005
DTC P1146, P1166 HO2S2
2005 QX56
DTC Confirmation ProcedureUBS00H85
NOTE:
If DTC confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
WITH CONSULT-II
TESTING CONDITION:
For better results, perform “DTC WORK SUPPORT” at a temperature of 0 to 30 °C (32 to 86 °F).
1. Turn ignition switch ON and select “DATA MONITOR” mode with
CONSULT-II.
2. Start engine and warm it up to the normal operating tempera-
ture.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Start engine and keep the engine speed between 3,500 and
4,000 rpm for at least 1 minute under no load.
5. Let engine idle for 1 minute.
6. Make sure that “COOLAN TEMP/S” indicates more than 70°C
(158°F).
If not, warm up engine and go to next step when “COOLAN
TEMP/S” indication reaches to 70°C (158°F).
7. Open engine hood.
8. Select “HO2S2 (B1) P1146” or “HO2S2 (B2) P1166” of “HO2S2” in “DTC WORK SUPPORT” mode with
CONSULT-II.
9. Start engine and following the instruction of CONSULT-II.
NOTE:
It will take at most 10 minutes until “COMPLETED” is displayed.
10. Make sure that “OK” is displayed after touching “SELF-DIAG RESULTS”.
If “NG” is displayed, refer to EC-421, "
Diagnostic Procedure" .
If “CAN NOT BE DIAGNOSED” is displayed, perform the following.
a. Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).
b. Return to step 1.
Overall Function CheckUBS00H86
Use this procedure to check the overall function of the heated oxygen sensor 2 circuit. During this check, a 1st
trip DTC might not be confirmed.
WITH GST
1. Start engine and warm it up to the normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
4. Let engine idle for 1 minute.
5. Set voltmeter probes between ECM terminal 55 [HO2S2 (B1) signal] or 74 [HO2S2 (B2) signal] and
ground.
SEF 1 74 Y
PBIB2372E

Page 1608 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1146, P1166 HO2S2
EC-417
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Revision: October 20052005 QX56
6. Check the voltage when revving up to 4,000 rpm under no load
at least 10 times.
(Depress and release accelera

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